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Ishida N, Ito M, Murakami M. Thermal Metathesis of C–C Single Bonds Induced by Steric Frustration. CHEM LETT 2022. [DOI: 10.1246/cl.220208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Naoki Ishida
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
| | - Misato Ito
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
| | - Masahiro Murakami
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
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Astakhov AV, Chernenko AY, Kutyrev VV, Ranny GS, Minyaev ME, Chernyshev VM, Ananikov VP. Selective Buchwald–Hartwig arylation of C-amino-1,2,4-triazoles and other coordinating aminoheterocycles enabled by bulky NHC ligands and TPEDO activator. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01832b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A facile method for selective N-(hetero)arylation of coordinating 3(5)-amino-1,2,4-triazoles under Pd/NHC catalysis using TPEDO as a new efficient Pd(ii) to Pd(0) reductant has been developed.
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Affiliation(s)
- Alexander V. Astakhov
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
| | - Andrey Yu. Chernenko
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
| | - Vadim V. Kutyrev
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
| | - Gleb S. Ranny
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
| | - Mikhail E. Minyaev
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Victor M. Chernyshev
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
| | - Valentine P. Ananikov
- Platov South-Russian State Polytechnic University, (NPI), Prosvescheniya st., 132, Novocherkassk, 346428, Russia
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
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Charboneau DJ, Huang H, Barth EL, Germe CC, Hazari N, Mercado BQ, Uehling MR, Zultanski SL. Tunable and Practical Homogeneous Organic Reductants for Cross-Electrophile Coupling. J Am Chem Soc 2021; 143:21024-21036. [PMID: 34846142 DOI: 10.1021/jacs.1c10932] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The syntheses of four new tunable homogeneous organic reductants based on a tetraaminoethylene scaffold are reported. The new reductants have enhanced air stability compared to current homogeneous reductants for metal-mediated reductive transformations, such as cross-electrophile coupling (XEC), and are solids at room temperature. In particular, the weakest reductant is indefinitely stable in air and has a reduction potential of -0.85 V versus ferrocene, which is significantly milder than conventional reductants used in XEC. All of the new reductants can facilitate C(sp2)-C(sp3) Ni-catalyzed XEC reactions and are compatible with complex substrates that are relevant to medicinal chemistry. The reductants span a range of nearly 0.5 V in reduction potential, which allows for control over the rate of electron transfer events in XEC. Specifically, we report a new strategy for controlled alkyl radical generation in Ni-catalyzed C(sp2)-C(sp3) XEC. The key to our approach is to tune the rate of alkyl radical generation from Katritzky salts, which liberate alkyl radicals upon single electron reduction, by varying the redox potentials of the reductant and Katritzky salt utilized in catalysis. Using our method, we perform XEC reactions between benzylic Katritzky salts and aryl halides. The method tolerates a variety of functional groups, some of which are particularly challenging for most XEC transformations. Overall, we expect that our new reductants will both replace conventional homogeneous reductants in current reductive transformations due to their stability and relatively facile synthesis and lead to the development of novel synthetic methods due to their tunability.
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Affiliation(s)
- David J Charboneau
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Haotian Huang
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Emily L Barth
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Cameron C Germe
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Brandon Q Mercado
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Mycah R Uehling
- Discovery Chemistry, HTE and Lead Discovery Capabilities, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Susan L Zultanski
- Department of Process Research and Development, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
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Schwartz LA, Spielmann K, Swyka RA, Xiang M, Krische MJ. Formate-Mediated Cross-Electrophile Reductive Coupling of Aryl Iodides and Bromopyridines. Isr J Chem 2021; 61:198-301. [PMID: 34334805 PMCID: PMC8323530 DOI: 10.1002/ijch.202000069] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Indexed: 12/15/2022]
Abstract
Two catalytic systems for the formate-mediated cross-electrophile reductive coupling of 4-iodoansiole with 6-bromopyridines are described. Using homogenous rhodium or heterogeneous palladium catalysts, the product of reductive biaryl cross-coupling could be formed in moderate yield with excellent levels of chemoselectivity.
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Affiliation(s)
- Leyah A Schwartz
- Department of Chemistry, University of Texas at Austin, Welch Hall, 105 E 24 St., Austin, TX 78712, USA
| | - Kim Spielmann
- Department of Chemistry, University of Texas at Austin, Welch Hall, 105 E 24 St., Austin, TX 78712, USA
| | - Robert A Swyka
- Department of Chemistry, University of Texas at Austin, Welch Hall, 105 E 24 St., Austin, TX 78712, USA
| | - Ming Xiang
- Department of Chemistry, University of Texas at Austin, Welch Hall, 105 E 24 St., Austin, TX 78712, USA
| | - Michael J Krische
- Department of Chemistry, University of Texas at Austin, Welch Hall, 105 E 24 St., Austin, TX 78712, USA
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